Mitsubishi inverter energy saving and environmental protection tips
1. The fan running curve adopts the frequency converter to control the fan, which belongs to the power saving method of reducing aerodynamics. Compared with the commonly used method of adjusting the air volume to control the damper, it has obvious power saving effect.
The diagram can explain its power saving principle:
In the figure, curve (1) is the wind pressure-flow (HQ) characteristic of the fan at constant speed n1, and curve (2) is the wind resistance characteristic of the pipe network (full throttle). Curve (4) is the inverter operating characteristics (full throttle)
Assume that the wind turbine works at point A with the highest efficiency. At this time, the wind pressure is H2, and the air volume is Q1. The shaft power N1 is proportional to the product of Q1 and H2, and is represented by the available area AH2OQ1 in the figure. If the production process requires, the air volume needs to be reduced from Q1 to Q2. At this time, adjusting the damper method is equivalent to increasing the pipe network resistance and changing the pipe network resistance characteristics to the curve (3). The system is changed from the original operating point A to the new one. The operating point B runs. As can be seen from the figure, the wind pressure increases but the shaft power is proportional to the area BH1OQ2. Obviously, the shaft power does not drop much. If the inverter speed control method is adopted, the fan speed is reduced from n1 to n2. According to the proportional law of the fan parameters, the characteristic of the speed n2 air flow (QH) is drawn, as shown by the curve (4). It can be seen that under the condition of satisfying the same amount of air flow Q2, the wind pressure H3 is greatly reduced, and the power N3 is significantly reduced with the area CH3OQ2. The saved power ΔN=(H1-H3)×Q2 is represented by the area BH1H3C. Obviously, the economic effect of energy saving is very obvious.
2. The energy saving rate of the fan at different frequencies It is known from the principle of fluid mechanics that the fan air flow is related to the motor speed power: the air flow rate of the fan is proportional to the rotation speed of the fan (motor), the wind pressure of the fan and the rotation speed of the fan (motor) When the square is proportional, the shaft power of the fan is equal to the product of the air volume and the air pressure, so the axial power of the fan is proportional to the quadratic power of the fan (motor), ie the axial power of the fan is proportional to the quadratic power of the power supply frequency.
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